docs: Rename "Advanced" section to "Guides"

docs/_meta.json

@@ -36,8 +36,8 @@
     },
     {
         "type": "dir",
-        "name": "advanced",
-        "label": "Advanced"
+        "name": "guides",
+        "label": "Guides"
     },
     "security",
     {

docs/_nav.json

@@ -1,8 +1,8 @@
 [
     {
-        "text": "Guide",
+        "text": "Documentation",
         "link": "/introduction",
-        "activeMatch": "^/(introduction|configuration|deploying|calls|appservices|maintenance|troubleshooting|advanced)"
+        "activeMatch": "^/(introduction|configuration|deploying|calls|appservices|maintenance|troubleshooting|guides)"
     },
     {
         "text": "Development",

docs/advanced/_meta.json

@@ -1,18 +0,0 @@
-[
-    {
-        "type": "file",
-        "name": "delegation",
-        "label": "Delegation / split-domain"
-    },
-    {
-        "type": "file",
-        "name": "dns",
-        "label": "DNS tuning (recommended)"
-    },
-    {
-        "type": "file",
-        "name": "performance",
-        "label": "Performance tuning"
-    }
-
-]